Base for air system



FIG. 1 is a top perspective view of a base for air system showing my new design.

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a bottom view thereof; and

FIG. 6 is a rear view thereof;

FIG. 7 is a right side view of the base for air system of FIG. 1; and,

FIG. 8 is a left side view thereof. 

CLAIM The ornamental design for a base for air system, as shown and described. 